Polyether-modified polysiloxane containing a perfluoropolyether group and its production method

Abstract

A polyether-modified polysiloxane containing a perfluoropolyether group and its production method are provided. The polysiloxane has both the properties of a perfluoropolyether and the properties of a polyether-modified silicone, and it also has high affinity for organic solvents as well as coating compositions, cosmetics, and various coating materials. The polysiloxane is represented by the following general formula (1): wherein Rf is a perfluoroalkyl group; X is fluorine atom or trifluoromethyl group; Q is a divalent organic group, R is hydrogen atom, an alkyl group, or acyl group; R 1 and R 2 are an alkyl group, aryl group, or an aralkyl group; a, b, c, d are 0 to 200; a+b+c+d is at least 1; e is 0 or 1; p and q are 0 to 50 with the proviso that p+q is at least 2; and k is 1 to 3.

The invention claimed is: 
     
       1. A polyether-modified polysiloxane containing a perfluoropolyether group represented by the following general formula (1): 
       
         
           
           
               
               
           
         
         wherein Rf represents a straight chain or branched perfluoroalkyl group containing 1 to 10 carbon atoms; X represents fluorine atom or trifluoromethyl group; Q represents a divalent organic group containing 1 to 12 carbon atoms; R represents an alkyl group or acyl group containing 1 to 6 carbon atoms; R 1  and R 2  are independently an alkyl group, aryl group, or an aralkyl group containing 1 to 10 carbon atoms; a, b, c, d are independently an integer of 0 to 200 with the proviso that a+b+c+d is at least 1; e is 0 or 1; p and q are independently an integer of 0 to 50 with the proviso that p+q is at least 2; and k is an integer of 1 to 3. 
       
     
     
       2. A polyether-modified polysiloxane containing a perfluoropolyether group according to  claim 1  represented by the following general formula (2): 
       
         
           
           
               
               
           
         
         wherein Q, R, p, q, p+q, and k are as described above, and f is an integer of 2 to 200. 
       
     
     
       3. A polyether-modified polysiloxane containing a perfluoropolyether group according to  claim 1  wherein content of the fluorine atom by weight in the molecule is in the range of 20 to 70% by weight. 
     
     
       4. A method for producing a polyether-modified polysiloxane containing a perfluoropolyether group according to  claim 1  comprising: steps of
 reacting a vinyl group-containing perfluoropolyether represented by the following general formula (3): 
 
       
         
           
           
               
               
           
         
         wherein Rf, X, Q, a, b, c, d, a+b+c+d, and e are as described above with a tetraorganocyclotetrasiloxane for hydrosilylation to produce a perfluoropolyether-modified cyclotetrasiloxane; and 
         reacting the perfluoropolyether-modified cyclotetrasiloxane with an allyl group-containing polyether compound represented by the following general formula (4): 
       
       
         
           
           
               
               
           
         
         wherein R, p, q, and p+q are as described above for hydrosilylation to produce the polyether-modified polysiloxane containing a perfluoropolyether group.